A three-phase, 4-pole, 60-cycle, 110-volt wound rotor induction motor has its stator connected in wye and its rotor in delta. The stator and rotor windings have the same number of conductors. The rotor resistance and reactance at standstill are 0.18 ohm and 0.75 ohm respectively. If normal voltage is applied on the stator, calculate the rotor current at (A) starting, (B) when rotor speed is 1,720 rpm. [ Answer: 82.34A;15.42 A. ]

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Winding and Constructions

Alternating Current (AC) winding is generally of the 3-phase type due to the inherent advantages of the 3-phase machine. Armature coils must be connected to the yield balance (equivalent in magnitude and 2/3 of the series phase difference of the rod) 3-phase electromotive forces (emf). The armature should be divided into step-bands to start with slots around the perimeter.In the construction of AC machines, the frame is used as an external protective shield to protect it from environmental conditions. The frame also serves as the outer perimeter, allowing the interior to be easily placed. The static state section of the devices is the stator winding attached stator.